We have a Domain with 2000, XP and 7 clients in at the minute, domain functional level is 2003. We introduced 2 2012 R2 DC's the other week and started to get KDC Errors in the event log (guessing these are from 2000 clients).

Do any of you guys have experience with 2000 clients talking to a 2012 Server even though Domain Functional Level is 2003?

Computers that run Windows 8 are also able to join domains that have domain controllers that run earlier version of Windows Server, including Windows Server 2003 or later. In this case however, some Windows 8 features may require additional configuration or may not be available. For more information about those features and other recommendations for managing Windows 8 clients in downlevel domains, see Running Windows 8 member computers in Windows Server 2003 domains.

Yes, in my scenario I can add workstation with W2k OS to domain but when I try log to domain (DC with W2k12 R2 OS) i get error "The trust relationship between this workstation and the primary domain failed".
Read this: https://technet.microsoft.com/en-us/library/hh994618.aspx - part: Windows client and Windows Server operating systems that are supported to join Windows Server domains

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While processing a TGS request for the target server krbtgt/DOMAIN.LOCAL, the account COMPA@DOMAIN.LOCAL did not have a suitable key for generating a Kerberos ticket (the missing key has an ID of 8). The requested etypes were 18. The accounts available etypes were 23 -133 -128 3 1.

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